Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ion-exchange polymer or process of preparing
Patent
1994-04-26
1997-04-29
Kulkosky, Peter F.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ion-exchange polymer or process of preparing
521 33, B01D 7168, B01D 7176
Patent
active
056249659
ABSTRACT:
The present invention discloses permselective membranes comprising at least one layer formed from an arylenedialkylidene polymer at least a portion of which is sulfonated, said arylenedialkylidene polymer comprising recurring monomeric units as shown by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl having one to four carbon atoms; wherein A and B are different;
A is selected from the group consisting of ##STR2## wherein R.sub.x is hydrogen or an alkyl having 1 to 4 carbon atoms, R.sub.5 is alkylidene of 1-4 carbon atoms or oxyalkylene of 1-4 carbon atoms;
B is derived from the group consisting of benzene, naphthalene, thiophene, and aromatic compounds of the formula ##STR3## wherein R.sub.6 is selected from the group consisting of alkylidene of 1-4 carbon atoms, oxyalkylene of 1-4 carbon atoms, --O--, --S--; R.sub.7 and R.sub.8 may be the same or different and may be H or methyl; and n is a number sufficient to provide a copolymer having a molecular weight sufficient to form a film. Processes for making said membranes and their use as ion exchange membranes are also disclosed.
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Chlanda Frederick P.
Huang Jian-Ping
Kulkosky Peter F.
The Graver Company
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